Elasticity and Toughness in Materials and Hardware
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Questions and Answers

What property is indicated by a metal's letter designation separated from the alloy designation by a dash?

  • Ductility
  • Malleability
  • Hardness (correct)
  • Tensile strength

    • Which type of steel does not accept heat treatment?

  • Medium-carbon steel
  • Manganese steel
  • High-carbon steel
  • Low-carbon steel (correct)

    • What property makes medium-carbon steels especially adaptable for machining or forging?

  • Desirable surface hardness
  • High ductility
  • High hardness
  • Ability to accept heat treatment (correct)

    • Which alloying agent acts as a hardener when alloyed with steel?

    <p>Silicon</p> Signup and view all the answers

    In what applications are high-carbon steels primarily used?

    <p>Springs, files, and cutting tools</p> Signup and view all the answers

    What characteristic makes Mangalloy unique?

    <p>Extreme anti-wear properties</p> Signup and view all the answers

    Which property refers to a metal's tendency to return to its original shape after stretching and bending?

    <p>Elasticity</p> Signup and view all the answers

    What property describes a material's ability to resist tearing or breaking when bent or stretched?

    <p>Toughness</p> Signup and view all the answers

    When a metal can carry heat or electricity, it is said to have good ____________.

    <p>Conductivity</p> Signup and view all the answers

    What is the term for the property of a metal to expand when heated and shrink when cooled?

    <p>Thermal Expansion</p> Signup and view all the answers

    Which property involves a material's ability to absorb heat before conducting or carrying it away?

    <p>Conductivity</p> Signup and view all the answers

    Metals that can carry heat also carry ____________, making them good electrical conductors.

    <p>'Electrons'</p> Signup and view all the answers

    What can be added to steel to counteract the negative effects of sulphur?

    <p>Manganese</p> Signup and view all the answers

    How does phosphorus affect low-carbon steel's resistance to atmospheric corrosion?

    <p>Improves resistance</p> Signup and view all the answers

    What does nickel contribute to steel during the heat treatment process?

    <p>Adds strength and hardness</p> Signup and view all the answers

    What effect does manganese have on a metal's forging characteristics?

    <p>Makes it less brittle at rolling and forging temperatures</p> Signup and view all the answers

    How does adding small amounts of sulphur affect the machinability of steel?

    <p>Improves machinability</p> Signup and view all the answers

    What undesirable effect does sulphur have on steel when rolled or forged?

    <p>Causes brittleness</p> Signup and view all the answers

    What is the main characteristic of chromium steel?

    <p>Increased wear and corrosion resistance</p> Signup and view all the answers

    How does nickel contribute to steel when alloyed with chromium?

    <p>Toughens steel</p> Signup and view all the answers

    What is the primary purpose of molybdenum in aircraft structural steel?

    <p>To reduce grain size and increase impact strength</p> Signup and view all the answers

    Why is chrome-moly steel an ideal choice for landing gear structures?

    <p>Excellent wear resistance</p> Signup and view all the answers

    What type of steel alloy does vanadium produce when combined with chromium?

    <p>Strong, tough, and ductile</p> Signup and view all the answers

    In what components are ball bearings typically made, according to the text?

    <p>Chrome-vanadium steel</p> Signup and view all the answers

    What is the primary element responsible for the mechanical properties of steel?

    <p>Carbon</p> Signup and view all the answers

    What is the main objective of heat treatment in steel?

    <p>Change physical and mechanical properties</p> Signup and view all the answers

    Why are high-carbon steels particularly suitable for heat treatment?

    <p>They respond well to heat treatment</p> Signup and view all the answers

    What does the annealing process do to steel?

    <p>Softens and relieves internal stress</p> Signup and view all the answers

    Which material exceeds commercial use compared to any other material?

    <p>Steel</p> Signup and view all the answers

    How does heat treatment impact product performance in manufacturing processes?

    <p>By increasing strength or other desirable characteristics</p> Signup and view all the answers

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